Thermal properties of fractions of corn stover

Czajkowski, Łukasz; Wojcieszak, Dawid; Olek, Wiesław; Przybył, J.

doi:10.1016/j.conbuildmat.2019.03.092

Cited by 27 publications

(16 citation statements)

References 26 publications

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“…In 2017, EU maize grain production was over 70 million tonnes [5], and for comparison in Beijing in 2012 alone, 1.20 million tonnes maize straw was produced [6], and all over China more than 2.7 × 10 8 tonnes has been produced annually [7]. Such a high production of maize grain causes crop residues, such as leaves, stalks, husks, and cobs, which can constitute up to 50% of the dry matter yield of whole maize plants [8,9]. The fractions mentioned above have different chemical compositions, structure, and fiber properties [10,11], harvesting times, and even topography or soil types [12,13].…”

Section: Introductionmentioning

confidence: 99%

Maize Straw as a Valuable Energetic Material for Biogas Plant Feeding

et al. 2019

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Maize has great potential, especially as a substrate for biofuels production. The aim of this paper is to analyze the possibility of usage in methane fermentation maize straw harvested in different weather conditions, which had an influence on different physical parameters, mainly the dry mass content. The research has shown that maize straw harvested in Central-Eastern Europe can have a broad spectrum of dry mass content, which is related to diverse weather conditions during autumn. However, independently from moisture content, maize straw can be a good (for more wet material) or very good (for more dried straw) substrate for the biogas plant. With the methane productivity reaching 201–207 m3/Mg of fresh mass, this material is a significantly better substrate than that typically used in Europe maize silage (approximately 105 m3/Mg FM). It was noted that the retention time for maize straw (36–42 days) is longer than in the case of maize silage (less than 30 days). However, this difference is quite small and can be accepted by the biogas plant operators.

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Section: Introductionmentioning

confidence: 99%

Maize Straw as a Valuable Energetic Material for Biogas Plant Feeding

et al. 2019

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“…The test results of specific heat capacity and thermal conductivity in the temperature range from 293 K to 373 K are listed in Table 1. The specific heat capacity of absolutely dry sweet sorghum stalk can be estimated by subtracting the proportion of water and ethanol, which is less than the literature data of intact corn stalks [26] due to air being mixed between the smashed particles, which is consistent with the actual distillation process. Figure 3 shows the relationship between temperature and specific heat capacity or thermal conductivity.…”

Section: Specific Heat Capacity and Thermal Conductivitymentioning

confidence: 62%

Optimization of Continuous Solid-State Distillation Process for Cost-Effective Bioethanol Production

2020

Energies

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To improve the efficiency of bioethanol production, an advanced process was required to extract ethanol from solid-state fermented feedstock. With regard to the characteristics of no fluidity of solid biomass, a continuous solid-state distillation (CSSD) column was designed with a proprietary rotary baffle structure and discharging system. To optimize the operation condition, fermented sweet sorghum bagasse was prepared as feedstock for a batch distillation experiment. The whole distillation time was divided into heating and extracting period which was influenced by loading height and steam flow rate simultaneously. A total of 16 experiments at four loading height and four steam flow rate levels were conducted, respectively. Referring to packing, rectifying column, mass, and heat transfer models of the solid-state distillation heating process were established on the basis of analyzing the size distribution of sweet sorghum bagasse. The specific heat capacity and thermal conductivity value of fermented sweet sorghum bagasse were tested and served to calculate the ethanol yielding point and concentration distribution in the packing. The extracting process is described as the ethanol desorption from porous media absorbent and the pseudo-first-order desorption dynamic model was verified by an experiment. Benefit (profit/time) was applied as objective function and solved by successive quadratic programming. The optimal solution of 398 mm loading height and 8.47 m3/h steam flow rate were obtained to guide a 4 m in diameter column design. One heating and two extracting trays with 400 mm effective height were stacked up in an industrial CSSD column. The steam mass flow rate of 0.5 t/h was determined in each tray and further optimized to half the amount on the third tray based on desorption equation.

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“…Boards containing husks had generally higher values of volumetric heat capacity with an increasing proportion of husks in the board. However, boards containing 80% husks achieved much lower volumetric heat capacity values than boards from the husks specified in the work of Czajkowski et al [22]. The reason for this difference may be a difference in the density of the boards (Table 3).…”

Section: Resultsmentioning

confidence: 86%

Waste Utilization: Insulation Panel from Recycled Polyurethane Particles and Wheat Husks

et al. 2019

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This study provides a solution for the utilization of two waste materials, namely the residues of soft polyurethane foam from the production of mattresses and winter wheat husks. Thermal insulation panels with a nominal density of 50–150 kg/m3, bonded one-component moisture curing polyurethane adhesive, were developed, and the effect of the ratio between recycled polyurethane foam and winter wheat husk on internal bond strength, compressive stress at 10% strain, water uptake, coefficient of thermal conductivity, and volumetric heat capacity was observed. The developed composite materials make use of the very good thermal insulation properties of the two input waste materials, and the coefficient of thermal conductivity of the resulting boards achieves excellent values, namely 0.0418–0.0574 W/(m.K). The developed boards can be used as thermal insulation in the structures of environmentally friendly buildings.

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Thermal properties of fractions of corn stover

Cited by 27 publications

References 26 publications

Maize Straw as a Valuable Energetic Material for Biogas Plant Feeding

Maize Straw as a Valuable Energetic Material for Biogas Plant Feeding

Optimization of Continuous Solid-State Distillation Process for Cost-Effective Bioethanol Production

Waste Utilization: Insulation Panel from Recycled Polyurethane Particles and Wheat Husks

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